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Date: Sat, 21 Apr 2012 01:05:38 +0200
From: Vadim Zeitlin <va...@wxwidgets.org>
Subject: Re[8]: [wx-dev] GDI vs GDI+ performance (was: More thoughts about wxAndroid)
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On Fri, 20 Apr 2012 14:01:00 +0200 Eric Jensen wrote:

EJ> I did some further research here, the problem is not only GDI+, but
EJ> wxGCDC itself. When drawing a wxBitmap it will be converted to a
EJ> wxGraphicsBitmap first. This conversion takes place pixel-by-pixel and
EJ> is pretty slow.
EJ> ( see wxGDIPlusBitmapData ctor in /src/msw/graphics.cpp )

 It definitely shouldn't be done every time when the bitmap is drawn.

EJ> So when working with wxGraphicsContext, using a wxGraphicsBitmap
EJ> should be encouraged.

 Of course.

EJ> Having that said, working with wxGraphicsBitmap only is a little
EJ> inconvient at the moment, as it doesn't even provide methods to get the
EJ> width or height

 This seems really strange and is almost certainly an oversight. At least
GDI+ Bitmap definitely can returns its width and height and it should be
possible to implement it everywhere by just storing the size if necessary.
Any patches doing this would be very welcome.

 Regards,
VZ

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